container/init: use absolute compare method

More checks are also added.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/autoroot_test.go

@@ -27,7 +27,7 @@ func TestAutoRootOp(t *testing.T) {
 			resolved: []Op{new(BindMountOp)},
 		}, true},
 
-		{"differs", &AutoRootOp{
+		{"prefix differs", &AutoRootOp{
 			Host:   MustAbs("/"),
 			Prefix: "\x00",
 			Flags:  BindWritable,
@@ -37,6 +37,26 @@ func TestAutoRootOp(t *testing.T) {
 			Flags:  BindWritable,
 		}, false},
 
+		{"flags differs", &AutoRootOp{
+			Host:   MustAbs("/"),
+			Prefix: ":3",
+			Flags:  BindWritable | BindDevice,
+		}, &AutoRootOp{
+			Host:   MustAbs("/"),
+			Prefix: ":3",
+			Flags:  BindWritable,
+		}, false},
+
+		{"host differs", &AutoRootOp{
+			Host:   MustAbs("/tmp/"),
+			Prefix: ":3",
+			Flags:  BindWritable,
+		}, &AutoRootOp{
+			Host:   MustAbs("/"),
+			Prefix: ":3",
+			Flags:  BindWritable,
+		}, false},
+
 		{"equals", &AutoRootOp{
 			Host:   MustAbs("/"),
 			Prefix: ":3",